Corded circular saw borrowed. Ass hat used it to cut metal. With a nice Freud blade. The WOOD cutting kind. Said ass hat also managed to turn the saw into a cordless saw

Ass hat said he'd replace the saw and blade for me. This was 2 days before he was moving out of state. The day he moved, he stopped by and dropped of a brand spanking new Chicago or Tool Shop or some other ass-tastic brand circular saw complete with shiny new manufacturer's blade
My saw & blade - $175. His saw & blade - $29.99

Sawzall with blades. DIFFERENT ass hat turns THAT into a cordless saw and returns it with absolutely NO blades. It was borrowed with about $80 in blades. Ass hat claims it only had the blade in the saw and one or two others in the case, and he used one up. I asked him how you "use up" a Sawzall blade in the time he had the thing, and told him he owes me $80 bucks for blades. I'm still waiting to see the guy again.
Sledgehammer. Buddy borrows it to split wood. I get it back with a busted handle right by the head and a new handle given to me. I'M expected to fix the thing since he made the gracious step to buy me a new handle

4 foot level. A guy on a job site knocks it onto the ground, breaking 2 of the vials, rendering a nice expensive level useless. I got the name of the guy who did it from several "witnesses". They all gave the same story, so if I ever see "Not Me" around, I'ma gonna kick his ass

Corded drill. Got it back without the bits or the chuck key and a busted trigger that I was never told about. Asking the person about it got an "It worked fine and didn't seem to have any problems when I used it".
Chain saw. Borrowed it to someone I trusted, who borrowed it later on to someone I didn't. I got it back with a bent bar, dull chain that was actually MISSING A PIN somehow, and NO bar oil and a nice frozen sprocket. Thankfully, the person I trusted was pissed and was a good enough friend that he replaced it since it was his fault he borrowed it to an ass hat.
Tape measure x 1,000,000. There isn't a job I've been on that hasn't required buying a new tape measure when done. It seems no one can figure out how to work those pesky things without bending the blade, pulling the hook tab off the end, or flat out dropping it and breaking it. These same ass hats are the ones who naturally can't figure out how to BUY one before coming to the jobsite. I am always happy to take them to Home Depot BEFORE lunchtime to buy me a new tape.
Impact screwdriver. I actually had someone give this back to me with NO bits whatsoever with it, and was told "I didn't think you gave it to me with any bits"! They bought me a new one, since all they could find was a single straight bit.
Router. We were moving from NC back to WI. My kids took my router still in the router table outside to put into the moving van. It never made it inside for some reason, and the nice hurricane-style rainstorm it sat in while outside made it a nice doorstop. It was my first-ever router I ever bought, and I relegated it to table duty because it wasn't worth much and was perfectly suited to table use because of its limited capabilities, so I didn't even bother seeing if it could be reconditioned when it wouldn't work when plugged in.
Pool pump. Borrowed out to help a neighbor with a flooded basement. They let it run. And run. And run.

"We thought it'd shut off when all the water was out". BS. I made sure to SPECIFICALLY TELL THEM they couldn't leave the pump unattended because the pump would burn out if it WASN'T submerged in water and once it was getting close, they HAD to turn it off and remove the rest of the water some other way. It WAS replaced, but we didn't talk much after that incident. That was ok with me.
This isn't all, this is just what's coming up right now. I stopped borrowing tools out about 5 years ago. I'd bring tools along if I was helping with the work, but there's only a single person I'd ever borrow any of my tools to anymore, and it's because he's proven himself to be trustworthy by replacing the "miscellaneous" items that go with a tool, or he's had to replace a tool he broke and never told me he was replacing it until I asked him why he was giving me this "new-looking" tool back instead of mine.
Stuff that happens on the jobsites, I can't help, other than to carry a spray bottle like you use to spray a cat when they do something you don't want them to do and walk up to them and spray them in the face and say "NO!" in a loud voice
The wife and kids have done many more frustrating things, but they're my wife and kids, what're ya gonna do? Well, you've seen what I'm gonna try
